I think admech could go to T4 in 11th
*EDIT I'm talking about admech battle line here, can't change title unfortunately
I collect admech, knights and orks, so I've been keeping a finger on the pulse of the new ork datasheet reveals. A lot of the ork datasheets are increasing in durability: Nazdreg wears mega armour and he's T7 when mega armour was T6 before; nobz now have 3W instead of 2; killa kans went up to T7 from T6; ghazghull went up to T10 from T6, went from 10W to 16W and now has Lone Op; the stompa now has a 5+ invuln. A lot of the Orks are also a lot more killy than before, which leads me to believe that as GW's favourites the Space marines will increase in durability for parity with the orks, with marines going up to T5, and terminators and gravis going to T6 and T7 respectively.
If that happened, T4 would open up to factions that are tougher than guardsmen but less tough than marines, like admech and sisters of battle. Granted it's a big reach but I don't think it's impossible that many of the factions could be scaled up in durability and damage this edition.